Examples

He wants to recycle setting for future stories, so all of the most-entertaining characters have to survive through the end of the story (or at least die in nebulous ways so that he can bring them back, if need be).

Now I'm no economist -- my understanding of economic theory can best be described as nebulous -- and I am aware that others whose views I hold in high regard, such as Brad DeLong and Paul Krugman, have come out in (very) tentative support of the plan (despite having their own deep misgivings), so I won't dwell on its merits.

Of course, it's possible that these productivity decreases are a natural correction from last year's gains and studies like the Civility Poll should be taken with a grain of salt -- how do you define a term as nebulous as civility?

It's all nebulous, which is particularly unreasonable considering your staunch condemnation of these concepts that you cannot define!